Robtex

Up: 72.135.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.135.56.0/22
Down right: 72.135.60.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.135.56.3	A+PTR	cpe-72-135-56-3.wi.res.rr.com
72.135.56.4	A	cpe-72-135-56-4.wi.res.rr.com
72.135.56.9	A+PTR	cpe-72-135-56-9.wi.res.rr.com
72.135.56.11	A+PTR	cpe-72-135-56-11.wi.res.rr.com
72.135.56.16	A+PTR	cpe-72-135-56-16.wi.res.rr.com
72.135.56.20	A	bodybybrockman.com
72.135.56.20	A	cpe-72-135-56-20.wi.res.rr.com
72.135.56.21	A	cpe-72-135-56-21.wi.res.rr.com
72.135.56.33	A+PTR	cpe-72-135-56-33.wi.res.rr.com
72.135.56.34	A+PTR	cpe-72-135-56-34.wi.res.rr.com
72.135.56.38	A	cpe-72-135-56-38.wi.res.rr.com
72.135.56.43	A+PTR	cpe-72-135-56-43.wi.res.rr.com
72.135.56.45	A	cpe-72-135-56-45.wi.res.rr.com
72.135.56.54	A	cpe-72-135-56-54.wi.res.rr.com
72.135.56.56	A+PTR	cpe-72-135-56-56.wi.res.rr.com
72.135.56.58	A+PTR	cpe-72-135-56-58.wi.res.rr.com
72.135.56.63	A	cpe-72-135-56-63.wi.res.rr.com
72.135.56.73	A+PTR	cpe-72-135-56-73.wi.res.rr.com
72.135.56.77	A	cpe-72-135-56-77.wi.res.rr.com
72.135.56.85	A	cpe-72-135-56-85.wi.res.rr.com
72.135.56.98	A+PTR	cpe-72-135-56-98.wi.res.rr.com
72.135.56.106	A+PTR	cpe-72-135-56-106.wi.res.rr.com
72.135.56.107	A+PTR	cpe-72-135-56-107.wi.res.rr.com
72.135.56.109	A	cpe-72-135-56-109.wi.res.rr.com
72.135.56.118	A	cpe-72-135-56-118.wi.res.rr.com
72.135.56.120	PTR	cpe-72-135-56-120.wi.res.rr.com
72.135.56.122	A+PTR	cpe-72-135-56-122.wi.res.rr.com
72.135.56.125	A	cpe-72-135-56-125.wi.res.rr.com
72.135.56.127	A	cpe-72-135-56-127.wi.res.rr.com
72.135.56.129	A+PTR	cpe-72-135-56-129.wi.res.rr.com
72.135.56.135	A	cpe-72-135-56-135.wi.res.rr.com
72.135.56.136	A+PTR	cpe-72-135-56-136.wi.res.rr.com
72.135.56.137	PTR	cpe-72-135-56-137.wi.res.rr.com
72.135.56.137	A	mail.pcnetbuilder.com
72.135.56.137	A	vacationsbykathy.com
72.135.56.147	PTR	cpe-72-135-56-147.wi.res.rr.com
72.135.56.156	A	cpe-72-135-56-156.wi.res.rr.com
72.135.56.164	A	cpe-72-135-56-164.wi.res.rr.com
72.135.56.165	A	cpe-72-135-56-165.wi.res.rr.com
72.135.56.171	A+PTR	cpe-72-135-56-171.wi.res.rr.com
72.135.56.176	A+PTR	cpe-72-135-56-176.wi.res.rr.com
72.135.56.178	PTR	cpe-72-135-56-178.wi.res.rr.com
72.135.56.180	A	cpe-72-135-56-180.wi.res.rr.com
72.135.56.188	A	cpe-72-135-56-188.wi.res.rr.com
72.135.56.191	A	cpe-72-135-56-191.wi.res.rr.com
72.135.56.196	A	cpe-72-135-56-196.wi.res.rr.com
72.135.56.197	A	cpe-72-135-56-197.wi.res.rr.com
72.135.56.201	A+PTR	cpe-72-135-56-201.wi.res.rr.com
72.135.56.204	A	cpe-72-135-56-204.wi.res.rr.com
72.135.56.218	A+PTR	cpe-72-135-56-218.wi.res.rr.com
72.135.56.220	A	cpe-72-135-56-220.wi.res.rr.com
72.135.56.224	A+PTR	cpe-72-135-56-224.wi.res.rr.com
72.135.56.232	A+PTR	cpe-72-135-56-232.wi.res.rr.com
72.135.56.235	A+PTR	cpe-72-135-56-235.wi.res.rr.com
72.135.56.243	A+PTR	cpe-72-135-56-243.wi.res.rr.com
72.135.56.251	A+PTR	cpe-72-135-56-251.wi.res.rr.com
72.135.57.93	A	sontar.net
72.135.60.137	PTR	cpe-72-135-60-137.wi.res.rr.com
72.135.60.200	A+PTR	cpe-72-135-60-200.wi.res.rr.com
72.135.60.200	A	milwaukeedraincleaning.com
72.135.60.200	A	alexthienllc.com
72.135.60.253	A	cpe-72-135-60-253.wi.res.rr.com